48300 61600 70700 69300 合并单元格的快捷键后如何计算这列的和

来源：蜘蛛抓取(WebSpider) 时间：2012-05-23 06:44 标签： 合并单元格的快捷键
PC CPU Performance Comparisons - Including Athlon 64 and Core 2 Duo Benchmark Results
PC CPU Performance Comparisons
From Roy Longbottom's Benchmark Results
The document contains tables of CPU performance from 80486 to Intel Core i7 and AMD Phenom II,
including speed via caches and RAM derived from my benchmarks and results reports, which are available
from Compuserve PC Hardware Forum and .
In analysing results of the different benchmarks, in virtually all cases (except for RAM), CPU speed, including using data in cache, is shown to be proportional to CPU MHz for a particular type of processor. So it has been decided to show the MHz of available CPUs and provide simple tables with one set of numbers for each type of CPU.
For results depending on memory speed, results are provided for a range of RAM types.
As the number and type of instructions used in the benchmarks is known, performance results can be easily converted to Millions of Instructions Per Second (MIPS) or Millions of Floating Point Operations Per Second (MFLOPS). Comparison numbers represent percentages of MIPS or MFLOPS divided by CPU MHz.
Intel CPU Characteristics
AMD CPU Characteristics
Performance Comparisons
CPU/L1 Cache Speed
CPU/L2 Cache Speed
1. CPU Performance Tables - Introduction
In analysing results of the different benchmarks, in virtually all
cases, CPU speed, including using data in cache, is shown to be
proportional to CPU MHz for a particular type of processor. So it
has been decided to show the MHz of available CPUs and provide simple
tables with one set of numbers for each type of CPU. As the number
and type of instructions used in the benchmarks is known, performance
results can be easily converted to Millions of Instructions Per
Second (MIPS) or Millions of Floating Point Operations Per Second
(MFLOPS). Comparison numbers represent percentages of MIPS or MFLOPS
divided by CPU MHz.
CPUs can have more than one Integer or Floating Point Pipeline where
each might be able to produce one result per Hz. The first Intel Pentium 4 Integer
Pipelines could execute two instructions per cycle.
Then there are MMX, SSE and SSE2 Single Instruction Multiple Data functions,
using 64 or 128 byte registers, where 2 to 4 calculations can be carried out
simultaneously. Furthermore, with floating point, linked add and multiply
instruction can produce two results per clock cycle for each register element
(SSE up to eight 32 bit calculations per clock). The net result is that
the percentage calculations can be greater than 100.
Overall processor performance depends on the type/version and speed
of CPU and cache sizes along with memory speed, which is dependent on
the system board used. No attempt is made to provide an overall
performance rating, the overall aim being to show some strengths and
weaknesses of each type of processor.
The introduction of the Intel i7 processor leads to a major complication as it
does not necessarily run at a constant GHz speed. In the event of only one
processor being used, and it is not too hot, a Turbo Boost function increases
CPU GHz. A reducing speed increase using 2, 3 or 4 CPUs can also be applied
(see Turbo Boost from Contents table). In the results tables, two percentage
calculations are shown based on normal and boosted speed.
Some information on
is also included.
Note that these benchmarks reflect performance of one CPU on multi-core processors.
2. CPU Characteristics
Some of the following have been gathered from benchmark results and magazines
and may not be completely accurate. Mobile CPUs have the same speeds
using mains power but might have diferent size L2 caches and slower RAM.
A special CPUID assembly code instruction enable details of processor
characteristics to be obtained including model codes.
These codes were originally three hexadecimal digits known as Family, Model and
Stepping, the latter digit showing changes for minor bug fixes. An extra
Extended Model digit was included later. Different types of processor, such as
Pentium, Celeron and Xeon, have the same Family and Model codes, which invariably
means that the core CPUs have identical performance characteristics (cache sizes
and connectivity will be different). Later, CPUID functions produce the processor
marketing name and model.
Intel model codes are readily available via their 揚rocessor Spec Finder

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